1) I've been doing Cocoa development for 13 years, and I absolutely love Swift. I've switched to it for all my own projects (at least the ones where I would previously have used Objective-C), and I'm never looking back.

2) For medium projects: absolutely. For large projects: I haven't had the pleasure yet, but the truth is that Swift encourages a much better approach to modularity, and if you're working in a large project as a monolith, you're probably doing something wrong.

3) Hands down, yes.